Just eight days after the release of iOS 8.4 – the current latest operating system available for iPhone, iPad and iPod Touch – it is already running on more than 40% of compatible devices. Apple Music, which was launched alongside iOS 8.4, is being considered one of the main factors of such rapid adoption.

iOS 8.4 features include an all new Music app with Apple Music – Apple’s own music streaming service – among other bug fixes and performance improvements. The launch of the new music streaming service alongside iOS 8.4 is being credited for such fast adoption rate.

Mixpanel, an analyst firm who has been on iOS 8.4 popularity watch, says that such adoption rate may be “dangerous for Spotify.” “That’s hundreds of millions of people who can get a free three-month trial with Apple Music.”

Apple is offering its iOS users a 3-months trial of Apple music free of cost, after which users will have to subscribe for either an individual plan at $9.99, or a family plan for up to six family users priced at just $14.99. Apple’s individual plan for its music streaming service is at par with Spotify while the family plan is not matched by Spotify or any of its rivals.

Apple Music not only offers millions of tracks for streaming, it also comes with Beats 1 radio, a worldwide channel that’s live 24/7. iOS 8.4 is available for iPhone 4s and up, iPad 2 and up, and iPod Touch 5g. Follow this link to download iOS 8.4, and then follow our guide on how to install iOS using iTunes.

Latest data published on Apple’s dashboard fro developers reveals that the percentage of iPhone, iPad and iPod Touch devices running iOS 8 remained flat as off July 6, 2015, measured by the app store.